The Patagonia Nano-Air Hoody is a lightweight synthetic insulation piece for cold weather.  It is designed to keep you warm when stopped but breathes well enough so that you don't have to stop to take it off when you're working hard. Perfect for rock/alpine climbing and ski touring. The outer is a light but durable 87% recycled Polyester which offers a four way mechanical stretch and has excellent breathability. The DWR finish to the outer ensures snow and moisture are easily repelled. The insulation is Patagonia's own synthetic FullRange, which provides an excellent level of warmth but is also incredibly breathable and stretchy.  The Low bulk quilting on the sides of the torso keeps the insulation where it needs to be whilst also improving the shape and slim fit. The hood and cuffs are all stretchy so they stay in place and are easy to pull on and off. The pocket configuration leaves plenty of storage space with one zipped chest pocket and two hand warmer pockets, all of which are low bulk so they won't interfere with a harness or pack strap. The main zip has a top zip garage which becomes a chin guard for added comfort. Patagonia Nano-Air Hoody Features FullRange insulation Lightweight Polyester shell DWR finish Stretchy hood and cuffs 2 low bulk hand warmer pockets 2 zipped chest pocket Stuffs into chest pocket Dual adjustable draw cord hem Retro P6 logo Fit:Slim Weight:346g Patagonia Nano Air Hoody